You'd do well to devide this up into paragraphs and spiff up the capitalization. Also, this is set in knightly times, right? How about instead of using a modern idea, like "goth-looking dress," you use a timeless or a knightly-era way to describe it. When in doubt, just say "a long black dress."
Remember, if this is a fantasty-type universe, you can say something like, "a long dress made out of witchcloth" (and explain what witchcloth is later). If this is historical fiction, then find out what kind of cloth people made dresses out of, like linen or homespun.